I am gonna visit DC early next week. Taking the train back to Pittsburgh on Tuesday.

Looking at the MARC schedule and the Amtrak schedule, I was gonna take the MARC to Harpers Ferry so I could photograph Amtrak coming into the station and then board the Amtrak train to return to Pittsburgh. Looking at the train's schedules shows that it is doable with the MARC arriving first.

My question is:

Is the MARC train always the first into the station or does Amtrak have priority?